/*
* Copyright (c) 2003-2007 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
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* Version 2.0 (the 'License'). You may not use this file except in
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*//*
* Virtual memory map purgeable object definitions.
* Objects that will be needed in the future (forward cached objects) should be queued LIFO.
* Objects that have been used and are cached for reuse (backward cached) should be queued FIFO.
* Every user of purgeable memory is entitled to using the highest volatile group (7).
* Only if a client wants some of its objects to definitely be purged earlier, it can put those in
* another group. This could be used to make all FIFO objects (in the lower group) go away before
* any LIFO objects (in the higher group) go away.
* Objects that should not get any chance to stay around can be marked as "obsolete". They will
* be emptied before any other objects or pages are reclaimed. Obsolete objects are not emptied
* in any particular order.
* 'purgeable' is recognized as the correct spelling. For historical reasons, definitions
* in this file are spelled 'purgable'.
*/
#ifndef_MACH_VM_PURGABLE_H_
#define_MACH_VM_PURGABLE_H_/*
* Types defined:
*
* vm_purgable_t purgeable object control codes.
*/typedefint vm_purgable_t;
/*
* Enumeration of valid values for vm_purgable_t.
*/
#defineVM_PURGABLE_SET_STATE ((vm_purgable_t) 0) /* set state of purgeable object */
#defineVM_PURGABLE_GET_STATE ((vm_purgable_t) 1) /* get state of purgeable object */
#defineVM_PURGABLE_PURGE_ALL ((vm_purgable_t) 2) /* purge all volatile objects now */
#defineVM_PURGABLE_DEBUG_SHIFT 12
#defineVM_PURGABLE_DEBUG_MASK (0x3 << VM_PURGABLE_DEBUG_SHIFT)
#defineVM_PURGABLE_DEBUG_EMPTY (0x1 << VM_PURGABLE_DEBUG_SHIFT)
#defineVM_PURGABLE_DEBUG_FAULT (0x2 << VM_PURGABLE_DEBUG_SHIFT)
/*
* Volatile memory ordering groups (group zero objects are purged before group 1, etc...
* It is implementation dependent as to whether these groups are global or per-address space.
* (for the moment, they are global).
*/
#defineVM_VOLATILE_GROUP_SHIFT 8
#defineVM_VOLATILE_GROUP_MASK (7 << VM_VOLATILE_GROUP_SHIFT)
#defineVM_VOLATILE_GROUP_DEFAULT VM_VOLATILE_GROUP_7
#defineVM_VOLATILE_GROUP_0 (0 << VM_VOLATILE_GROUP_SHIFT)
#defineVM_VOLATILE_GROUP_1 (1 << VM_VOLATILE_GROUP_SHIFT)
#defineVM_VOLATILE_GROUP_2 (2 << VM_VOLATILE_GROUP_SHIFT)
#defineVM_VOLATILE_GROUP_3 (3 << VM_VOLATILE_GROUP_SHIFT)
#defineVM_VOLATILE_GROUP_4 (4 << VM_VOLATILE_GROUP_SHIFT)
#defineVM_VOLATILE_GROUP_5 (5 << VM_VOLATILE_GROUP_SHIFT)
#defineVM_VOLATILE_GROUP_6 (6 << VM_VOLATILE_GROUP_SHIFT)
#defineVM_VOLATILE_GROUP_7 (7 << VM_VOLATILE_GROUP_SHIFT)
/*
* Purgeable behavior
* Within the same group, FIFO objects will be emptied before objects that are added later.
* LIFO objects will be emptied after objects that are added later.
* - Input only, not returned on state queries.
*/
#defineVM_PURGABLE_BEHAVIOR_SHIFT 6
#defineVM_PURGABLE_BEHAVIOR_MASK (1 << VM_PURGABLE_BEHAVIOR_SHIFT)
#defineVM_PURGABLE_BEHAVIOR_FIFO (0 << VM_PURGABLE_BEHAVIOR_SHIFT)
#defineVM_PURGABLE_BEHAVIOR_LIFO (1 << VM_PURGABLE_BEHAVIOR_SHIFT)
/*
* Obsolete object.
* Disregard volatile group, and put object into obsolete queue instead, so it is the next object
* to be purged.
* - Input only, not returned on state queries.
*/
#defineVM_PURGABLE_ORDERING_SHIFT 5
#defineVM_PURGABLE_ORDERING_MASK (1 << VM_PURGABLE_ORDERING_SHIFT)
#defineVM_PURGABLE_ORDERING_OBSOLETE (1 << VM_PURGABLE_ORDERING_SHIFT)
#defineVM_PURGABLE_ORDERING_NORMAL (0 << VM_PURGABLE_ORDERING_SHIFT)
/*
* Obsolete parameter - do not use
*/
#defineVM_VOLATILE_ORDER_SHIFT 4
#defineVM_VOLATILE_ORDER_MASK (1 << VM_VOLATILE_ORDER_SHIFT)
#defineVM_VOLATILE_MAKE_FIRST_IN_GROUP (1 << VM_VOLATILE_ORDER_SHIFT)
#defineVM_VOLATILE_MAKE_LAST_IN_GROUP (0 << VM_VOLATILE_ORDER_SHIFT)
/*
* Valid states of a purgeable object.
*/
#defineVM_PURGABLE_STATE_MIN 0 /* minimum purgeable object state value */
#defineVM_PURGABLE_STATE_MAX 3 /* maximum purgeable object state value */
#defineVM_PURGABLE_STATE_MASK 3 /* mask to separate state from group */
#defineVM_PURGABLE_NONVOLATILE 0 /* purgeable object is non-volatile */
#defineVM_PURGABLE_VOLATILE 1 /* purgeable object is volatile */
#defineVM_PURGABLE_EMPTY 2 /* purgeable object is volatile and empty */
#defineVM_PURGABLE_DENY 3 /* (mark) object not purgeable */
#defineVM_PURGABLE_ALL_MASKS (VM_PURGABLE_STATE_MASK | \
VM_VOLATILE_ORDER_MASK | \
VM_PURGABLE_ORDERING_MASK | \
VM_PURGABLE_BEHAVIOR_MASK | \
VM_VOLATILE_GROUP_MASK | \
VM_PURGABLE_DEBUG_MASK)
#endif/* _MACH_VM_PURGABLE_H_ */